Spaceborne very-long baseline interferometric sar system and implementation method

A design apparatus for a spaceborne very-long baseline InSAR system, comprising the following modules:

• a derivation module configured to, with specific to bistatic interferometry, analyze relationships among an elevation accuracy, a phase error and a coherence, thereby deriving a relationship between the elevation accuracy and perpendicular baseline;
• an analysis module configured to, with specific to the bistatic interferometry, analyze a relationship between the coherence and each of the perpendicular baseline and a critical baseline in conjunction with the critical baseline;
• a proportion and elevation accuracy acquisition module configured to acquire a relationship between a ratio of the perpendicular baseline to the critical baseline and the elevation accuracy in conjunction with the relationship derived by the derivation module and the relationship analyzed by the analysis module;
• an error analysis module configured to perform InSAR time series deformation rate error analysis, thereby deriving a relationship between deformation rate accuracy and each error source, which comprises:
• considering a relationship between deformation rate measurement accuracy and each of atmospheric delay, decorrelation noise, system phase noise, orbital error, and DEM error;
• and
• a relationship acquisition module configured to derive an influence of the decorrelation noise on the deformation rate accuracy;
• and acquire a relationship between a ratio of a coherent temporal baseline to a revisit time and the deformation rate accuracy in conjunction with the relationship derived by the error analysis module, which comprises:
• analyzing a covariance matrix of a time series of the decorrelation noise;
• and comprehensively considering the coherent temporal baseline, the revisit time and long-term coherence to obtain the relationship between the ratio of the coherent temporal baseline to the revisit time and the deformation rate accuracy.